Guillermo I de Brunswick (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Guillermo I de Brunswick" in Spanish language version.

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wikipedia.org

de.wikipedia.org

Paul Zimmermann (1897), «Wilhelm, Herzog zu Braunschweig und Lüneburg», Allgemeine Deutsche Biographie (ADB) (en alemán) 42, Leipzig: Duncker & Humblot, pp. 729-730 .